<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>函数默认参数</title>    <script src="node_modules/babel-core/browser.js"></script>    <SCRIPT type="text/babel">        // 函数的默认值         function fn(_name="你好") {             console.log(_name);         }         fn("他好");    </script></head><body></body></html>